add HTML meta tag for automatic light/dark mode

[ghost]

No description provided.

[dgw]

While I haven't directly tested this, the tag seems to function as intended on other pages I've seen using it. It's a very simple way of respecting the user's system-level theme preference without resorting to CSS nonsense, and is fairly well supported in major browsers now. https://caniuse.com/mdn-html_elements_meta_name_color-scheme

[ghost]

Works great. :) The look will vary by browser since they all use their own color schemes, but here's Firefox on macOS:

Screen.Recording.2023-11-10.at.3.59.37.PM.mov

Edit: and toggling light/dark modes:

Screen.Recording.2023-11-10.at.4.02.12.PM.mov

Edit 2: and another one toggling the preference within Firefox itself, rather than system-wide:

Screen.Recording.2023-11-10.at.4.05.08.PM.mov

[dgw]

Yep, good demos.

Decent CSS to pretty up the list a bit will be someone else's problem. 😝

[ghost]

Decent CSS to pretty up the list [...]

Bare minimum: needs to be a React project with 4GB of imports.

[Exirel]

I wanted to reword the commit and I think I more or less messed-up...

... but the change is in master now! So consider this PR merged. Not closed. I swear.